Results 31 to 40 of about 1,601,441 (195)

Preparation and characterization of poly(l-phenylalanine) chiral stationary phases with varying peptide length. [PDF]

, 2008
Three new chiral stationary phases with different lengths of l-phenylalanine peptide were prepared by solid-phase synthesis with tert-butoxycarbonyl (Boc)-l-phenylalanine on silica.
Ohba, Yoshihito, Kuroda, Naotaka, Ohyama, Kaname, Wada, Mitsuhiro, Nakashima, Kenichiro, Oyamada, Kana, Kishikawa, Naoya, Maki, Toshihide   +7 more
core   +1 more source

Chromatographic and spectroscopic studies on β-cyclodextrin functionalized ionic liquid as chiral stationary phase: Enantioseparation of NSAIDs

Adsorption Science & Technology, 2018
Recently, we reported a new chiral stationary phase prepared using β-cyclodextrin functionalized with aromatic ionic liquid which is aimed to enhance the performance of enantioseparation of flavonoids and β-blockers.
Nurul Yani Rahim, Kheng Soo Tay, Sharifah Mohamad   +2 more
doaj   +1 more source

Photochemically Immobilized 4-Methylbenzoyl Cellulose as a Powerful Chiral Stationary Phase for Enantioselective Chromatography

Molecules, 2016
A process to immobilize para-methylbenzoyl cellulose (PMBC) on silica gel has been developed and applied to prepare chiral stationary phases (CSPs) for enantioselective chromatography.
Eric Francotte, Dan Huynh, Tong Zhang
doaj   +1 more source

Estimating chiral selector potential of micelle-based mobile phases through the analysis of some enantiomeric mixtures

Journal of Taibah University for Science, 2021
The present work aims to present two new concepts concerned with chiral separation. First, chiral separation of some enantiomeric drugs, using micelle-based liquid chromatography without any chiral selector, whether in the stationary phase or the mobile ...
M. E. K. Wahba, D. El Sherbiny, D. El Wasseef   +2 more
doaj   +1 more source

The Enantioselective Potential of NicoShell and TeicoShell Columns for Basic Pharmaceuticals and Forensic Drugs in Sub/Supercritical Fluid Chromatography

Molecules, 2023
The enantioselective potential of two macrocyclic glycopeptide-based chiral stationary phases for analysis of 28 structurally diverse biologically active compounds such as derivatives of pyrovalerone, ketamine, cathinone, and other representatives of ...
Denisa Folprechtová, Martin G. Schmid, Daniel W. Armstrong, Květa Kalíková   +3 more
doaj   +1 more source

Cromatografia em leito móvel simulado na produção de substâncias enantiomericamente puras ou enriquecidas em larga escala

Química Nova, 2006
There is great interest nowadays in the use of preparative liquid chromatography as an effective tool for the production of enantiomerically pure, or enriched, compounds for the pharmaceutical industry.
Silva Junior Ivanildo José da, Veredas Vinícius de, Santos Marco Antônio Garcia dos, Santana Cesar Costapinto, Carpes Marcos José Souza, Correia Carlos Roque Duarte   +5 more
doaj   +3 more sources

Direct Access to Chiral Piperidines by Enantioselective HAT‐Initiated C(sp3)─H Oxidation

Angewandte Chemie, EarlyView.
The direct desymmetrization of piperidines is achieved through manganese‐catalyzed enantioselective α‐C(sp3)─H oxidation with hydrogen peroxide, affording versatile chiral N,O‐acetals in good yields and with high enantio‐ and diastereoselectivity. These intermediates provide access to diverse functionalized piperidines with retention of chirality ...
Sethuraman Muthuramalingam, Josep M. Luis, Arnau Call, Quentin Lefebvre, Matthew S. Sigman, Miquel Costas   +5 more
wiley   +2 more sources

Research Progress on the Development and Application of Cyclodextrin-Based Chromatographic Stationary Phases

Separations
This review systematically summarizes the novel preparation methods of cyclodextrin-based chromatographic stationary phases and their applications for chiral recognition in separation techniques such as capillary gas chromatography and high-performance ...
Wenlanqi Du, Jia Jia, Yinghong Zhao, Ailing Ning, Rongfu Huang   +4 more
doaj   +1 more source

Artificial molecular machines and motors—Design and control of nanoscale motion

FEBS Letters, EarlyView.
Molecules are constantly moving because of thermal fluctuations, but random motion alone cannot be exploited to perform directional tasks. Artificial molecular machines use chemical, electrical, or light energy to bias this motion. Molecular shuttles, rotary motors, and supramolecular pumps illustrate how nanoscale movement can be controlled and ...
Leonardo Andreoni, Alberto Credi
wiley   +1 more source

Enhancement of Dissymmetry Factors Through Axial Elongation of Hetero[n]helicenes

Angewandte Chemie, EarlyView.
A benzofuran scaffolding strategy enables the synthesis of hetero[9]‐, [12]‐, and [15]helicenes. Structural and chiroptical analyses demonstrate that systematic axial elongation increases helical distortion and significantly amplifies luminescence dissymmetry.
Jeppe S. Mogensen, Christoffer Bræstrup, Christoffer Warming, Georg I. Junker, Yann Lie, Mathias Hermann, Kurt V. Mikkelsen, Michael Pittelkow   +7 more
wiley   +2 more sources